different issues through the years, but the newest fight is over a dinosaur. >> it was a big story and a very unusual story. come in and seize sue, everything exploded. >> controversy tonight. controversy surrounding the institute and their most famous discovery. >> it may be the custody battle of the century. scientists, indians, the u.s. government. >> you find any fossils, the government may take them away. not only has he taken this dinosaur away, but he's taken our research away too, every photograph, every record we had about this dinosaur and the locality where she was found. >> sue was seized pursuant to a search warrant, but there was never a crime charged. >> pat and i talked about filing suit. you know, we sued the federal government for return of our property. >> the black hills institute said it purchased the fossil from maurice williams. originally maurice williams said that too, but then he changed his claim, and he said he had not sold the fossil and that he